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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b155b56c2c6d5c6b1596dce415061300a0980991428a03abca480126886a190' 
  AND token = 'kauSp8rSxw+sc3mNI/jtUaURDzI3k/Ho/CFV8dfG84Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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