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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5119a15ee16c1ec7d7114e75933be448c30b32a4459c59fb08513e81a19f4d' 
  AND token = 'krlSq0/Z+G4qyLF2x3tXkPGb8I5iaCWWhzDUV/pshfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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