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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727e3c052fe368553d2b8f617c94ed6659fc083b94099606f9823e00a81ba88b' 
  AND token = '2s8eVTmSBcuyqUIxFIHN/cg38nLIZNUIav1z5jtebDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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