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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a3dab642f80c0cf9ef10ac3e96118c96c0d0f0ed184e647126b011bb1a23f3' 
  AND token = 'S8EyttPOa/wCju+VOiu4+KHH9LRN3uzXqM7g5oZF7SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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