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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751aaa0d2d23b9c863b7ce78c8b26fbb922b6688c3201273db582e215116ae72' 
  AND token = '9M1Cn2LlvBEEJ9DYHFh3mdVNCgN3gUIKp3TDDlniXkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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