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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcef10be1f6a5a8fde8aafda3948aea08a95248e7a0875b639ac886f86aacd1' 
  AND token = '2GDpbAMJfjaaXS6bxW0gdub/x7Nw0up8dRGXZgaR3tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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