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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac073f745b175032798df6894737814d766f0e71940e476f6d64774f51fb1a47' 
  AND token = 'oN4t1ofUqpgCk7ey3dpQzkZjkRjFVjuezyZl2NME8HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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