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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38040571a528bf128e6b7122b46a848f57b8497e1301cd57d12d4038f9b4b696' 
  AND token = 'hllXAkaUSc7FQwtW6QxEhiLIvKYP8lt5SzDtz/UKw1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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