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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a5a0520bdc9ec74f7ab00dcf3ff3bd58ec4ba9dd2efe2cf2476d0aeb006780' 
  AND token = 'oH/3YT65aD2LH/Dic7MsrhhdtJLW88Y1tLe7u3rppz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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