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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c9268d09fc41aed68108551175af11749618d9be0e0daf32e73a2b2dc85134' 
  AND token = 'g1UaixnhliAnS8lLPnPKe7W0+W/Qgd2c3O9zaxCBSHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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