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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f51688b16c5c459d7c1721e1758a9c868bb28d0b0f7bc57c6d70f7f999892f7' 
  AND token = 'M7VFHB07a6e862XKZzCQP8gzx19LI5x93m/Q99waVt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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