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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8890fac00c0ed87f57678633bc14600feeb876655a2198bc985cbe9b2dad0f5' 
  AND token = 'z98SXgPHoAbhJJqkMhj0k/sNX5SUz4Pse5CiVOCOdRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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