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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db5a82bf839f38051a09c8b707ef5b85b0404fc2c4af1d087321db0c566b719' 
  AND token = 'x8ZKLm9h2faST7w19aPF0wVnj2f3u48RbQyiyFkrA90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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