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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d00b66464e35b02b54a3b90ffce27a68836ec706ec49909db441269134fad6d' 
  AND token = '3Qw9CMp8fYvWV7EBC9upejJ9OzgR39H3dQB7mo+fZQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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