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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d36f926bbdc93356387937ac014d09499e6ca86f131310c92aac0b4f080f6d8' 
  AND token = '7ONIYVYWCIMtvf/2E742N1Cif8Bdsv4AEeLkenSdn3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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