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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1904b40e04b09725950834f36309682739e9100960a5a6c0a4d2681c5f9a1615' 
  AND token = 'W4vn01pdsbXc0jC6oEaIT3Kl6Lx13o+syLjYmVF4JN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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