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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6451fb9c04adc3138b348808f0e305291e07757d0939b2853b43104295bd380' 
  AND token = 'HsLGiSdr3OBEoFAoZree2i7tUTmgKij6RQPFKjyiP6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}