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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9f5d1538c8fb3a176461310e7e643c813bd848bd406a0317d31a8dab2b92dc' 
  AND token = 'ZbBdpv2SVKIUk8VPV1fG1BczD5wCZ7DkH1k3XSPtOp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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