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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf13e4252b5fb674a4edc1bf2e1c16e3f76b00f669cf255262fc40abaadfb1fd' 
  AND token = 'Qkkf16AiZ4YpZ4eicdjQ+W95SLbvSY59wW9V2m9t2WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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