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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ff12c1e676aa85b80274334a74c14603837420a0f2e038902dfb79d3130db7' 
  AND token = 'asV2059+puLI5dEMv4CAfO8cDHbLBtX/3EFjVU6drVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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