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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bbffff86931dc0de529e351535b82fc85d3be002494fe1e1ba7982b67fd61b' 
  AND token = 'fsx/fHBHSUh9QS91zD2xxSzvYaLr0Xvkzun1R/g9XqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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