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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783b46c8a2adeb34e44924271cc4c7228a6b2beb3bae804b570789897e548d77' 
  AND token = 'Ut4Pfy1RScUU2l7+LFhczxFFBnk6+vp+CuTPLBwn020=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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