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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e6af1118f99b22e1de3ecedba4730623160fdc350f517ac3f6a8606e6230bf' 
  AND token = 'vbUt60vznbVeczOyCQ51hG5U56V+LR1IORxFOFRn50s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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