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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8c19c3dcd69a580d9f24bb4b02692e39ab00175daed8eeaad57e7752c50315' 
  AND token = 'bTPtYub0+4/QhyQreBA++xIbf8CxwTLT7mbpsoLtcIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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