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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d2fc6abb7f5017c47b8b3ece6ba6d3f3be52aa35bcab11e437b82ea4d5dede' 
  AND token = 'z+hljvaG5mwu3xwBFd5Z6+KmQa6GxbE1zB7MV7i4O3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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