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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a214955460caafd3da74b5c48a0473e3d08ecdfaa356e6721ee5f2bbc45cfee' 
  AND token = 'bxYKKGmfajL8hTu/fbmIqJfRrowSKepm5p/EbLSx/wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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