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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e332d077afa65122003ca0638b4daaefa09b67bfa537778984894c2ee692de7f' 
  AND token = 'pWIwc0wkI+H+NNFnih8isNbUhg97/L5V6i4JOsBkfbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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