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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273a6a156e298fe314b29717746e0ed909d22f99251f3ada9bd856bb56a9d433' 
  AND token = 'h8tWhEWl3cE2wGLjl81po01nEuvQq2XCnCE06Yb9Hbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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