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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c552d2e6e0ce34391346e19f2ec04e66dda8757b67a22bc67bf840b57013b9a' 
  AND token = 'QsR+NRl/Oqw5GAbUu0/65kfLJy2RBYrE0GWOQBFPvkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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