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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a20d766010ad8cbc05ae6a8c5c5dc492dca61cc99b1f0a14968b0163050fb67' 
  AND token = 'oq2bptiuNiRrf5AX5wFSYkGIm8jGVDm4OmGneqVSK5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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