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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b256a29b58c4e5a89c03c8aad3e20e905aea8ca62841d2d246ce2fa8072acb5' 
  AND token = 'vvC23Ealg02mTffsgU0XBQt+rKsAuGlZTI+Qudrg6lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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