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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5410a1b618f81e88188cdc6d9abcd1c56fc501efc324bcf29dfeb26b3ed946ac' 
  AND token = 'YMTzsXuDN7bnmCztlir5gD0MW0mqv6ehoyXCNs7oQ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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