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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63be6c14ce6692b3f9f838bbe8ea81728a1af86331a4fb974f4782801a2a9326' 
  AND token = 'GecNhCfIcL/+h/YRY2A0kUj3INvHxYHze6RXcM3p+fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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