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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88301e4d627c2eb4b87952040ffa5aa043391639a88c3695b6d0faed8046187e' 
  AND token = 'YrOM8IhXO7QMKHpmQz1qv0LSA9+M64LK16goDSHy3aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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