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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ad71476531ba107b7357409d7a7937891bfb8bc99b6c194236ef0d42b32324' 
  AND token = 'zPlEM2x0hE1mvmUTpCH2N/9Vb2G1BnzYN6tZddaPP70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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