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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4972211ab2b98928e18e7d7e64a7cad638cc2a01ba6f412375db6f87af097b' 
  AND token = 'jXbL/ciwcBALl4AkN64kvBC3/G11aSw4ixNx//ojHBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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