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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b936ee008af080d92d0494a78cb3048473394c72195dbe1d1c74cdd3f90082' 
  AND token = 'tG5d3mvuhtfRMZN8DsiB0Nfv8OoD67cD0nb28/tIuv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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