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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374c0babc2ce1c04da44ac5e5cd50a61be73d4e91a275a9040d0e05d3ee76748' 
  AND token = 'fB3aIhTX3haMfmI2qeq08jlRfn6Lb/Jh3pASSL10wtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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