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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9864713cbc836d688a1aee485f7301122f37aec7460f44c0578d45021bc805af' 
  AND token = '7jCbKiao6XwANw3h8xqbTypOtKe7+WnmCDPke/sSZJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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