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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d1d6faabb3e75af1df1961f146e6be91cd4bfcdcd39dac8a590738739819cd' 
  AND token = 'oWIfO0neio2qVzNfL94obQuoah8XckzxawRFnnv7nJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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