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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f61ec6392ddfc2e48001b0b21ed8e0f28fa2c8af2a0e571a5b2165ce568b5c8' 
  AND token = 'j7GgE9e9TOB1D7Gv4Ok+NkHaerIAMEKZJBtncQPdPHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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