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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffc9e906ed6e423c959fc4da18d102e70d1f4c256afec3051f2aaa1175885c3' 
  AND token = 'u36Jq1BjN8n33AjZkjODohF50vGBkZ7ENzDT3iVnMX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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