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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18d83c86cb1845f0e529ee52d9fcb93af834aa57c7451e46e021ce08d24ec0d' 
  AND token = 'oXLJFVN6HH6sdpA+1zHVQXXFfO6/H3aVlkrF8t9Ot28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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