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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b87368ac2199c5eb3d2a38e16d5456d24d4572ba6cd6faafc72ea5a4c4d8ce5' 
  AND token = 'yyku252DcrYj6M+9lRjSs98DbEpwv5y2RQLK2fbzovY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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