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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066e3a9e289fb69f6192767fab3b55de610bde7934bd8c14abb5d17fbe976ca5' 
  AND token = 'RCIrOq3AgxA0rXtKYEQ12qECfMu/6qkaWgykLaoUH6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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