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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757fdd55f12b1aa20d2b56f22410e858b04431b46e2c51267e17425b2039dda3' 
  AND token = 'atJbaaDsIgfbYEmD8Z30Lo2fQMZnxEgY79fLruucCWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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