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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab034dfce8f7a9c2736a9a3d5c78c3d00d75b373de4527c3d7038611035f22f9' 
  AND token = 'X3YPJxxw9s68GDR3skPClr/9DOmc3ABPSUAyWdr+DR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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