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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b463a2a1db052fb5568028680a4ae4f2ab551cbf3135ff14ac315cd5b1e61767' 
  AND token = '07cNwv/EZaLMC5f0zbszKIYzBq8bymq+XPipyDAVcFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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