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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640366c7f5b4aa9bfedfc988cea218bed901d52bd42556a16b25beaa542432d3' 
  AND token = 'sVaCE4J46cvIdwQw867dxsnYNottLCnnZJl/ufba3P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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