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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892bc9af52aed0463f0184ec74516a5a57a5a9a624ae19eb2cb5b3290404d37b' 
  AND token = 'aUFl308Y5PC/jBOLzBVo1BBaBZx7C2on1tCjE/fhJyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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