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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62023f88867e2287967a871fc54d24b4f03c9ebff3057bce63a769e8986901f' 
  AND token = 'bnW6wzCqSY5Fb6P/6qDQW7Prd1QV7VcTMCNuYxis+1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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